lol you think WOL is new? Far field communication? They have been able to do this on wifi and bluetooth since those technologies were prevalent in every coffeeshop.
I tested a "Faraday" box and Bluetooth and WiFi went through just fine. Also remember that a phone can still log data locally when it has no connection to the Internet, then upload it later.
I have two Faraday bags sized for a cell phone. I have tested phone signal, WiFi and Bluetooth. No signal penetrates the bags. The phone can log intermittent data when removed, but I don't see how it could even log locations if it can't get a signal. Edit: I should add that I experimented with a gps logging app that didn't work when the phone was in the bag.
I just got a big sheet of Faraday fabric and did some tests with Bluetooth. To my surprise even a tiny opening lets the signal out. It's all folded up with the phone in the middle, and if the layers weren't pressed down all around the signal would leak. For whatever reason I saw the signals as not being able to "turn" inside the enclosure to get to holes. Apparently they can.
Just goes to show the importance of testing such shields before trusting them. Now I know it does work and need to find the holes in the enclosures I had tested before. So small velcro cases won't work if there is a small gap where the velcro holds it shut. Pretty cool stuff.
The maximum size holes that you can have in the Faraday cage without compromising it's shielding capabilities is related to the wavelength of the frequency you are trying to block. Only solid metal walls will block all EM frequencies, but a cage can be made of a mesh that will block a specific range of frequencies but it needs to be 'tuned' to what you are trying to block
Edit to add: I did a quick bit of math... a hole size of less than one-tenth of the wavelength is a good starting point for a Faraday mesh but the conductivity of your shielding material and how thick it is also matters. Bluetooth has a wave length of about 6cm-12cm so I was expecting that your cage could tolerate holes up to 6mm... but your experimental results seem to indicate you have much less tolerance. It goes to show that real world validation of theory is always required. Good on you for testing.
SIM card is just subscriber information. They can still check the IMEI. How do you think they authenticate? IMEI connected to SIM. That's just for the customer side. The phones still communicate with the towers to verify.
[ + ] CoronaHoax
[ - ] CoronaHoax 0 points 1 monthMar 18, 2024 08:58:50 ago (+1/-1)
[ + ] BoozyB
[ - ] BoozyB 0 points 1 monthMar 18, 2024 10:16:22 ago (+0/-0)
[ + ] KyleIsThisTall
[ - ] KyleIsThisTall 0 points 1 monthMar 18, 2024 12:14:31 ago (+0/-0)
[ + ] KyleIsThisTall
[ - ] KyleIsThisTall 0 points 1 monthMar 18, 2024 12:10:36 ago (+0/-0)
[ + ] bobdole9
[ - ] bobdole9 1 point 1 monthMar 18, 2024 09:25:34 ago (+1/-0)
[ + ] drhitler
[ - ] drhitler 1 point 1 monthMar 18, 2024 10:34:47 ago (+1/-0)
[ + ] RevengeOfNeri
[ - ] RevengeOfNeri 5 points 1 monthMar 18, 2024 04:04:08 ago (+5/-0)
[ + ] BoozyB
[ - ] BoozyB 5 points 1 monthMar 18, 2024 06:41:29 ago (+5/-0)
[ + ] Prairie
[ - ] Prairie 5 points 1 monthMar 18, 2024 07:25:37 ago (+5/-0)*
[ + ] BoozyB
[ - ] BoozyB 7 points 1 monthMar 18, 2024 08:46:43 ago (+7/-0)*
The phone can log intermittent data when removed, but I don't see how it could even log locations if it can't get a signal.
Edit: I should add that I experimented with a gps logging app that didn't work when the phone was in the bag.
[ + ] bobdole9
[ - ] bobdole9 1 point 1 monthMar 18, 2024 10:47:55 ago (+1/-0)
[ + ] BoozyB
[ - ] BoozyB 2 points 1 monthMar 18, 2024 11:06:17 ago (+2/-0)
I doubt brand matters much, they're all made in China anyway.
https://www.ebay.com/sch/i.html?_nkw=faraday+bag&_trksid=p2334524.m4084.l1313&_odkw=farady+bag
[ + ] Glowbright
[ - ] Glowbright 2 points 1 monthMar 18, 2024 10:55:22 ago (+2/-0)
Then you did not have a real Faraday cage.
[ + ] Prairie
[ - ] Prairie 0 points 1 monthMar 18, 2024 14:45:46 ago (+0/-0)
[ + ] Prairie
[ - ] Prairie 0 points 1 monthMar 27, 2024 21:51:38 ago (+0/-0)
Just goes to show the importance of testing such shields before trusting them. Now I know it does work and need to find the holes in the enclosures I had tested before. So small velcro cases won't work if there is a small gap where the velcro holds it shut. Pretty cool stuff.
[ + ] Glowbright
[ - ] Glowbright 1 point 1 monthMar 28, 2024 18:06:26 ago (+1/-0)*
Edit to add: I did a quick bit of math... a hole size of less than one-tenth of the wavelength is a good starting point for a Faraday mesh but the conductivity of your shielding material and how thick it is also matters. Bluetooth has a wave length of about 6cm-12cm so I was expecting that your cage could tolerate holes up to 6mm... but your experimental results seem to indicate you have much less tolerance. It goes to show that real world validation of theory is always required. Good on you for testing.
[ + ] bobdole9
[ - ] bobdole9 1 point 1 monthMar 18, 2024 09:27:05 ago (+1/-0)
[ + ] KyleIsThisTall
[ - ] KyleIsThisTall 2 points 1 monthMar 18, 2024 12:12:55 ago (+2/-0)
[ + ] BoozyB
[ - ] BoozyB 1 point 1 monthMar 18, 2024 10:15:46 ago (+1/-0)
A phone without a sim will log the location of a wi-fi signal.
[ + ] bobdole9
[ - ] bobdole9 1 point 1 monthMar 18, 2024 10:46:58 ago (+1/-0)
[ + ] HeavyBrain
[ - ] HeavyBrain 10 points 1 monthMar 18, 2024 05:50:58 ago (+10/-0)
So we know what its for.
They showed us by making "being out without a phone" almost a criminal offense now.